I tore a calf muscle skiing four years ago. I was back on the bike after about six weeks I think, though I was a bit tentative about it for a while. The tear bled and then they found a blood clot, which may have delayed things a bit. I was certainly a bit hesitant about getting back on the bike while still on the warfarin.
Its more than 10 years since I did much audax, so I wasn't going back to PBP qualifier level of activity, and I was 56 when I tore it. By the summer I'd pretty much forgotten about it. If you are younger and fitter, I'd guess you'd recover much faster.